noiserefrigerator
My refrigerator (Bosch B22CT80SNS01) sits in an alcove and has begun intermittently making a noise from what seems to be the inside. At first I thought it was the water filter/lines having air, but I’ve switched the filter and cycled water for a few minutes. Running the water doesn’t stop the noise when it’s happening either, nor does it sputter.
It sounds like it’s behind an inside panel at the top, maybe a fan or something? See video below.
Most refrigerator alcoves are mini reverberation chambers, having hard sides. You may be able to place acoustic foam behind the refrigerator to absorb the sounds.
If you're handy sewing, you could copy this design for a sound reduction blanket using polyester fiber fill used for coats. As a trial, just loop a couple of layers of the batting off a couple eye hooks and leave space for air circulation. You may have to use some twine to belt it down flat. If it works, enclose in a cotton sack stitched down like a quilt.
To be clear, I'm only suggesting a flat wall hanging, nothing to trap heat.
Assuming no sledgehammers were used, you could be hearing a sheet metal change shape, triggered by temperature. It will likely be a large flat area of metal somewhere...
Best Answer
It turns out it was the air damper motor and so replacing the assembly did the trick! No more noise.